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A218871 as a simple table

n a(n)
2 0
3 2
4 4
5 12
6 20
7 52
8 100
9 214
10 414
11 876
12 1722
13 3524
14 6992
15 14144
16 28188
17 56720
18 113180
19 227084
20 453748
21 908804
22 1816726
23 3636336
24 7270770
25 14547228
26 29090912
27 58192994
28 116378984
29 232780848
30 465546796
31 931139720
32 1862251212
33 3724592874
34 7449128940
35 14898442336
36 29796768552

[0,2,4,12,20,52,100,214,414,876,1722,3524,6992,
 14144,28188,56720,113180,227084,453748,908804,
 1816726,3636336,7270770,14547228,29090912,
 58192994,116378984,232780848,465546796,931139720,
 1862251212,3724592874,7449128940,14898442336,
 29796768552]

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Last modified April 20 00:58 EDT 2024. Contains 371798 sequences. (Running on oeis4.)